Plans to build a huge underground bunker in Cumbria to store nuclear waste have been voted down by the county council.
The next stage would have been to search for a suitable site for the city-sized dump and look at the impacts, but that won't happen now.
Nuclear power is used to produce more than one sixth of the UK's electricity.
But the radioactive waste can remain dangerous for thousands of years.
It has to be put away safely so it's not harmful to humans.
This has been a controversial issue.
Campaigners said the underground dump would be bad for the Lake District National Park in Cumbria, one of the most beautiful places in the country.
But supporters argued that much of the waste is already in the area because of Sellafield nuclear plant.
They also pointed out the jobs and money that nuclear power brings in.
Nuclear waste is currently stored above ground in various sites across the UK.
Nuclear power is created by causing reactions to break apart atoms, the tiny building blocks of everything around us.
That releases a massive amount of heat, which is used to power a generator.